Sentinel-2 Cloud-Free Mosaic Generator

Overview

This Google Earth Engine (GEE) application allows users to generate cloud-free mosaics from Sentinel-2 Level 2A imagery for a user-defined period and geographical region. Users can select a country, specify a date range, apply cloud-masking techniques, and visualize different layers such as NDVI and false color composites. In the Code editor code, users can export the generated mosaics.

Run the application

Features

• Country Selection: Select a country from a dropdown list dynamically populated from the LSIB 2017: Large Scale International Boundary Polygons that were simplified.
• Cloud-Free Mosaic Generation: Sentinel-2 Level 2A imagery is processed to create a composite with minimal cloud cover.
• CloudScore+ Cloud Masking: Optionally apply an advanced cloud-masking technique to enhance mosaic quality.
• Custom Date Range: Define a specific time range to generate the mosaic.
• Adjustable Cloud Coverage: Set a maximum cloud coverage percentage for filtering images.
• Additional Visualization Layers: Add NDVI and false color composite layers for better analysis.
• Automatic Map Centering: The map zooms to the selected country for a better overview of the generated mosaic.
• Export to Google Drive: Save the generated mosaic and NDVI images to Google Drive.

How It Works

1. Select a country from the dropdown list.
2. Enter a start and end date for the desired time range.
3. Adjust the maximum cloud coverage threshold.
4. Choose whether to apply cloud masking using CloudScore+.
5. Select additional visualization layers, such as NDVI or false color composite.
6. Click the "Generate" button to process and display the mosaic.
7. Optionally, export the mosaic and NDVI images to Google Drive by running the GEE code in the Code Editor (it requires a GEE account and a cloud project).

Requirements for data download to Google Drive by running the GEE code in the Code Editor

• A Google Earth Engine account.
• Internet access and a compatible web browser.
• A Google Cloud Project.

Contributing

Contributions are welcome! If you find any issues or have suggestions for improvements, please open an issue or submit a pull request on GitHub.

License

This project is released under the MIT License. Feel free to modify and use it for your applications.